JPS6313891A - Improvement of propeller and screw - Google Patents

Abstract

PURPOSE:To increase propulsion or flying force by projectingly providing pressure receiving boards on one or several places of the end edges of a propeller or a screw, parabolically with respect to rotation, in a screw for a ship and a propeller for an aircraft. CONSTITUTION:Arc shaped or flat pressure receiving boards 2 are projectingly provided on the end parts and parts in between a shaft center and the end parts on the back side of a propeller 1 which was subjected to a prescribed torsional molding. As for the screw 3 of a ship, arc shaped pressure receiving boards 2 are projectingly provided on the end edges and the middle parts between a shaft center and the end edges on an outer face. And, a proper resistance is given to the flow of water or air due to the projectingly provided pressure receiving boards improving propulsion efficiency, thereby, increasing propulsion or flying force even if the rotating speed may be a little lower.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to conventional aircraft propellers and marine IJs,
- Regarding the improvement, the purpose is to provide a pressure receiving plate on one side of the propeller or screw itself that receives water pressure or wind pressure, and to prevent changes in the required number of revolutions regarding the speed of the propeller or screw during propulsion. It is intended to effectively and increase the propulsion force, and to be widely used for propulsion of aircraft and ships that use propellers.

<Prior Art> Conventionally, as mentioned above, in aircraft propellers and ship propellers, the number of rotational horsepower for propulsion varies depending on the lift force or displacement of the propellant, respectively. Whether it's an aircraft propeller or a ship's propeller, the blades themselves of the propeller or screw have a smooth surface, but each blade itself is twisted to a desired angle. Therefore, the propulsion force due to water pressure and wind pressure is determined by the torsion forming surface and rotation speed, etc., but the propeller and screw blade surfaces are not smooth, and the rotation and movable horsepower are large compared to the fuel consumption. This is what causes losses.

<Problems to be Solved by the Invention> From the above, first, the blades of the propeller and the screen should be processed in some way, or they can reasonably resist rotational resistance better than conventional blades. Therefore, it is desirable to research methods that are simple, do not impose too much stress, and are more efficient, such as by adding further innovations to the thread forming process. In any case, the current propellers and screws have been extensively researched, and it is best to utilize the blade shape that has been implemented to this day (not to mention that research and modification costs will also be reduced). None 0 <Means for solving the problem> As mentioned above, we decided to process it into a part of a conventional propeller or screw. Regarding propellers,
That is, an arc-shaped or flat pressure receiving plate (2) between the rear end, the axis, and the end of the propeller (1), which is formed by a predetermined twist. Projection (
(See Figures 3 to 5) Also, in the case of a ship's screw (3), an arc-shaped pressure receiving plate (2) is protruded from the edge of the outer surface and between the shaft center and the edge (see Figures 3 to 5). (See Figures 6 and 7)
FIG. 8 is a side view showing the state of implementation.

<Effects of the invention> The invention has the above-mentioned configuration, and both the propeller and the screw have an arcuate or linear pressure receiving plate (2) on the smooth surface of the blade.
Because it is installed protrudingly, unlike conventional models without pressure receiving plates, water,
The rotational resistance of the air is extremely small due to the radial flow along the blade surface, and therefore it is logical that the propulsive force also decreases during the same rotation. However, if a pressure receiving plate is provided at one or several places on the edge of the propeller or screw in a parabolic shape rather than on an inner rotation locus with respect to the rotation, the protruding pressure receiving plate can prevent water or air from flowing. Since it provides appropriate resistance to the flow and improves the propulsion efficiency, it has the effect of increasing the propulsive force or force even if the rotational speed is somewhat slow.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of an aircraft, FIG. 2 is a front view of a propeller, FIG. 3 is a rear view of the same, and FIG. 4 is a side view of a semi-propeller. , Figure 5 is a partially enlarged slope view, Figure 6 is a front view of the screw, Figure 7 is a front view of the screw.
The figure is a partial sectional view of the same as above, and FIG. 8 is an explanatory diagram showing the state of implementation. In addition, in the drawing (1)... Propeller (blade) (2)
...Pressure plate

Claims (1)

[Claims] In aircraft propellers and marine propellers,
An improved propeller and screw characterized by a pressure receiving plate protruding from one side of the blade root.